App note: Automobile harness protection

Polyswitch fuse use in automobile, app note from Littelfuse. Link here (PDF)

A vehicle’s ideal harness scheme has a hierarchal, tree-like structure with main power “trunks” dividing into smaller “branches,” with overcurrent protection at each node. This architecture allows the use of smaller, space-saving wires that can reduce weight and cost. It also optimizes system protection while providing fault isolation, which ultimately improves reliability.

Using resettable circuit protection devices that do not need to be driver accessible offers designers a number of solutions that may be used separately or in combination. A single junction box located in the instrument panel may still be employed. However, rather than being positioned close to the conventional fuses, resettable PolySwitch devices can be located inside the box or on another face, which can save frontal area. Moreover, placing them closer to the connectors allows the trace’s length to be reduced. As a result, the overall junction box can be downsized.

from Dangerous Prototypes

App note: Automatic AC line voltage selector

Implementation of automatic AC line voltage selector, App note from Littelfuse. Link here (PDF)

In some cases, appliances and equipment are able to operate when supplies by two different levels of AC line voltage to their main terminals (10V or 240V). This is why, it is very common that appliances and equipment have mechanical selectors or switches as an option for selecting the level of voltage needed. Nevertheless, it is also very common that these types of equipment can suffer extensive damage caused for not putting the selector in the right position. To prevent these kind of problems, thyristors can be used as a solution for making automatic voltage selectors in order to avoid possibilities of equipment damage due to over or low voltages AC line supplies to them.

from Dangerous Prototypes

Let’s make art at home this week

Digital Making at Home: Make art

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Digital Making at Home is a program which encourages young people to code and share along with us, featuring weekly themed content, code-along videos, livestreams, and more!

This week, we’re exploring making art with code. Many young makers are no stranger to making art, especially the digital kind! This week we’re inviting them to bring their most colourful and imaginative ideas to life with code.

So this week for Digital Making at Home, let’s make some art!

The post Let’s make art at home this week appeared first on Raspberry Pi.

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